Leaf spring question

[Ziegelsteinfaust]

I bought a 14 bolt SF for my truck today from a wrecker, and it came with leaf springs.

The springs it has are 5 leaf with plastic inserts that hold the leaf's apart about the thickness of a credit card. I do not know the year this rear-end came out of, and for the price loaded I was not going to argue.

My current 14 bolt FF has a 6 leaf pack with no inserts or plastic separators. I believe this to be a factory 79 K20 set-up.

Is the 5 leaf pack a lighter duty leaf pack or a different version of a 3/4 ton spring?

I am trying to soften the ride of the truck down to roughly a C10 ride for longer drives to fishing holes.